Valve mechanism



SePt- 7, 1943. E. MARTIN 2,328,880

1 VALVE MECHANISM Filed Feb. 25, 1942 2 Sheets-Sheet l Sept. `7, 1943. E. MARTIN 2,328,880

VALVE MECHANISM Filed Feb. 25, 1942 2 Sheets-Sheet 2 l Patented Sept. 7, 1943` i n ,h "tioncaf Delaware ebjeet ef the 'haven "en ifgge'videelveive elenelly adjusted Positie@ "efff bel'f'f manipulated to deliver fld t6 the f nbtr@ ai b deci alley breeigete H sedi te the eheheh ens and the engine, which valve may be regulated to control the steam pressure to the'engine. As an i illustration, the locomotive boiler pressure may be 250 pounds per square inch while the stoker engine may operate normally at 25 pounds per square inch.

At times, however, the stoker engine will stall, for example, when the stoker conveyor becomes overloaded or choked. When this occurs, it is desirable to deliver to the Stoker engine a sudden charge of steam at boiler pressure, whereupon in most instances the stoker engine will resume op-y eration and the overload or clog in the Stoker conveyor will be relieved. As soon as the over' load or clog is relieved it is desirable to instan@ taneously reduce the steam pressure to the stoker engine to its originall normal setting to prevent the stoker enginefrom racing.

There will now be described a simple and efcient combined operating and booster valve that is interposed in the steam line between the source of supply and the stoker engine and that accomplishes the above desired results. The novel combined operatingfand booster valve is shown at'22 in Figi.

Referring now to Figs. 2, 3 and 4 showing the details of construction of the novel combined operating and booster valve 22, the valve 22 com.- prises a valve body 23 having a valve seat 24 dividing the valve body into chambers` 25 and 26. The valve seat 24 is provided Witha valve opening 21 which connects the chambers 25 and 2'6 with one another when the valve 22 is open. The valve body 23 is provided with an inlet 28 through which steam passes from the locomotive boiler to the chamber v2 5, and an outlet 29 through which `steam passes from the chamber 2-6Vto the stoker engine E.

Threaded in the valve seat 24 is a seat ring 33 arranged to receive the lower disc portion .3| of the valve stem 32, the disc r3| and stem 32 being 50. -The hand wheel 48 is also provided with a groove (not shown) arranged to receive the keY 50.

By reason of the key and groove arrangement,

it will be seen that when the hand wheel 48" is turned, the valve stem 32 andbushing 41 turn along with it, whereby the bushing 41 can be threaded in and out of the collar 31, thereby moving the valve stem disc 3| `into Vengagement or away from theA seat ring 30. Also by reason of the key and groove arrangement, it

will be seen that by pulling the hand wheel 48 .instead of turning it, with a force suflicient to il U poundsper square inch, while the chamber 26 communicates with the Stoker engine E, which normally operates at, forexample, steam pressure of 25 pounds per square inch. The hand wheel 48 is, therefore, turned to move the disc 3| away from the seat ring 30 the required distance to admit steam from the chamber 25 to the cham- .y ber 26 at thejpressure necessary for normal opsecured together by disc stemring 33. The disc i 3| is received in the bonnet 34 which is secured to the valve body 23 by the union bonnet ring 3 5. The bonnet 34 rhas an integrally formed yoke 36 provided at its upper` end with an externally and internally threaded collar 31, through Whichcollar the upper end of the valve stem 32 projects.

To prevent leakage of steam between the disc 3| and the bonnet 34, 4the latter is provided with a stufng box in which is received packing 33. The packing 38 is retained in the stuing box by a lgland 39 which is securely held in place by the packing nut 40, the latter being in threaded en- `sagement withr the yoke 36 of the bonnet 34.

A compressed spring 4| surrounds the yoke 36 and is held between the upper retaining ring 42 and the lower retaining ring 43. The upper retaining ring 42 is vthreaded on the 'yoke collarl 31 ,bushing 41, through which bushing the fr-ee end of the valve stem 32 projectsl The projecting portion of the valve. `stem 32 carriesA a hand wheel 48 which is secured against the bushing 41 by a nut 49 threaded on the free end ofthe valve stem 32. The valve stem 32 isprovided at Vits upper end vwithakey-,/ll extending axially of the valve steinA 32, andthe bushing 4.1Iislprovided v.with agroove 15|', arrangedto receive thekey- .in normal operation.

eration of the Stoker engine E. The spring 4| retains the disc 3| atk this setting against the pressure in the chamber 25.

Now, if the stoker vconveyor should stall because` of a clog `or a hard lump of coal, the stoker operator grasps the hand wheel 48 and pulls it out, thereby moving the disc 3| away from its original setting and instantaneously providing 'a full opening at 21 to admit steam at boiler pressure to the lchamber 26 and the stoker engine E. At this v4| forces the disc 3| back to its original setting, thereby again admitting steam to the chamber 26 and the Stoker engine E at the pressure required I claim: Y

1. A valve comprising a casing, a seat in said casing, a bonnet mounted on the casing, a bushing threaded in the free end `of said bonnet, a valve member engageable with the seatforclosing` the valve, saidv valve member projecting through said bushing, locking means betweensaid bushing and said valve member providing forrotation of one by the other and providing for longitudinal movement ofsaidvalve memberfthrough said bushing, a handle associated with said bushing and valve membervior threading said bushing in and out of said bonnet to movesaid v alve member to any one of a number of set positions and for moving said valve member longitudinally from itsvset position by an application of 4manual force, and yieldable means for returningsaid valve member toward its set; position upon releasleof*y said force, said handle overlapping said bushing for limiting movement of said valve member vsaid yieldable means to its set position.

A valve comprising a casing, a seatin said casing, a bonnet mounted on the casing, a bushn, d y 2,328,880 ing threadedin the free end of said bonnet, a

valve member engageable `With the se'atfor Iclos-` through said bushing, said bushing and said valve member being provided one With a keyway and the other with an engaging key providing for longitudinal movement of `said valvev member threaded in the free end of said bonnet, a valve ing the valve,'said valve; member projecting through said bushing and providing Vforrotation of one by the other, a common mean'sassooiated with said bushing and valve member for selec-` "tively threading said bushing in and out of said bonnet for moving said valve memberto any one set position upon release of said `force, saidcom casing,` a bonnet `mounted on the casing, a bushing member engageable with the seat for closing the Valve, said valve member projecting through said bushing, looking means associated with said bushing and said valve memberproviding for rotation of one by the other and providing for longitudinal movement of said valve member through tion upon release of said force, said common mon means and said bushingproviding stop v means for limiting movement ofsaidvalve mem-` v `ber by said' yieldable means to its setposition. n

'3. A Valve `comprising a casing, (a seatinsaid means and said bushing providing stop means for EUGENE 

